|Basic Maths for Protein Crystallographers|
The length of the reciprocal lattice vector
is called d* and equals
Crystallographers often define |S|² as (d*)² or . S, a vector, is defined as s-s0, where s is in the direction of the scattered wave, and s0 is in the direction of the incident wave.
Protein crystallographers talk about resolution in terms of 1/d* (or d), hence the 'high resolution' limit is actually a small number.